Carburetor choke control



Sept. 9, 1930. w. "r. HUNT 1,775,127

GARBURETOR, CHOKE CONTROL Filed Sept. 14, 1927 VIII/M1114 INVENTOR.MIKE/r Zb m r ATTORNEY.

Patented Sept. 9, 1930 UNITED STATES PATENT OFFICE WARREN T. HUNT, OFTOLEDO, OHIO, ASSIGNOR TO THE WILLYS-QVERLAND COMPANY, V

or TOLEDO, OHIO, A conroRATIoN or 01110" CARBURETOR. onox'n conrnor.

My invention relates to carburetors for internal combustion enginescommonly employed in automobiles, and it has particular relation to theconstruction and operation of the choke valve.

It is commonly recognized that one of the more desirable methods ofstarting a gasoline engine which is relatively cool, is to enrich thecarburetor mixture for a short period of time until the combustionchamber attains its normal operative temperature. To this end mostcarburetors are provided with a choke valve which the driver can operateby actuating a choke control generally positioned near the steeringwheel. After the engine begins to run smoothly and the necessity for therich mixture no longer obtains, it is incumbent upon the driver toreturn the choke to its normal position. Failure to do so results inoverheating of the engine, fouling of the spark plugs, as well as anexcessive consumption of fuel.

Not infrequently it happens that the jostling of the car causes thechoke valve to close, at least partially, without being noticed by theoperator, until after the engine begins to operate irregularly.According to the present invention, these failings and shortcomings areovercome, thus one object of the invention is to provide a carburetorchoke valve which displays no tendency to close by reason of the jostleand shock that is normally imparted thereto.

Another object of the invention is to provide a carburetor structurewherein the choke valve will return to its open position automaticallyand without the attention of the driver.

A further object of the invention is to provide a carburetor structurewherein the choke valve will return to its open position automaticallyunder normal running conditions.

In so far as the elements of my improved carburetor are novel, theinvention contemplates a new method of operating internal combustionengines, according to which the choke valve is opened gradually by thevibration of the engine or the motor car in which it is installed. Abetter understanding of how these and other objects of the invention maybe realized can be had by referring to the accom anying drawings, inwhich Figure is an elevational view ofan embodiment of the inventionwhich may be preferred, and P Fig. II is a plan view partly in'section,of the structure illustrated in Fig. I. f

In practicing my invention, there is provided a carburetor shell orcasting 10 of conventional'or approved design, which includes an airintake opening 11 that is controlled by a choke Valve 12. The valveincludes a shaft 13 which is pivotally mounted in the casting and isprovided at one end with acontrol arm 14 that is operated by means of aWire 15 from the drivers seat. Betweenthe actuating arm and thecarburetor casting, a second arm'17 is interposed which is securedrigidly to the shaft and includes a weight 18 at its outer extremity;The other end of the shaft is provided with a coil spring 19 and a nut20 which is tightened to secure the desired amount of friction betweenthe weight arm 17 and the elements adjoining thereto, particularly thecasting 10. A lug 22 formed integrally with the carburetor castingadapted to engage witha projection 23 that forms a part of the actuatingarm 14, the relation of the parts be ing such that the projectioncontacts'with the lug 22in the open position of the choke as shown byfull lines of Figure 1.

It will be observed that in its open position the weight is preventedfrom pivoting downwardly in a counterclockwise direction by the pawlwhich is in engagement with the lug; whereas, in its closed position theweight is prevented from turning in a clockwise direction by reason ofthe valve member 12 within the intake portion of the casting. Thetendency of the choke valve to assume its wide open position will dependupon the friction between the pivotal weight arm member 17 and theadjoining casting member 10. The adjustment may be made whereby thevalve will not reach its wide open position until the automobile hastraveled some distance and the engine probably has its temperaturematerially increased.

From a consideration of the structure, it will be apparent to thoseskilled in the art that a carburetor ofmy design provides a gas imixture whose composition may be varied manually and which will have atendency to revert to normal mixture. It will also be apparent that theweight arm functions to main- 7 tain the choke in an open positionduring the normal operation of the engine, and also that the normalshock which the car encounters,

acts to return the choke valve to itswide open 7 v 10 position withoutany attention from the driver whatsoever. Although there is illustratedbut a single I embodiment of my invention, it will be apparent thatother embodiments may be, con-' structed with the same principles, and Idesire therefore that it be limited only as in dicated in the appendedclaims. 1 1 I claim: 1 1 1-. In a carburetor a pivotal choke valveprovided with an unbalanced weight adapted to'constantly urge the valveintoits open position. I

2. In acarburetora pivotal choke valve provided with an unbalancedweightadapted to urge the valve into its open position, and

1 friction means for regulating the pivotal movement. e a I 3. In acarburetor a choke valve provided with a weighted pivotable leverarm'secured to the choke valve adapted to constantly urge the valve intoan open position.

4; In a carburetora choke valve including a lever arm cooperativelypivotal with the valve adaptedito urge the'valve into an open position,and adjustable friction means for controlling the tendency of the valveto 5. In a carburetor a rotatable choke valve, means for manuallyopera'tingsaid valve, a

40 stop for limiting the movement of the valve in one directiomlandaweightedlever secured to the valve inposition to rotate the sameagainst the stop. v V In testimony whereof, I affix my signature. WARRENT. HUNT.

